Ok, time to update once more. I've tried your techniques (@cryrid), the "Project All" one first because it sounded more solid, from a topological point of view. .: I have imported the low-poly skull as a new subtool :. Manually aligned it to the sculpted one (apparently, it doesnt work unless the two models are…
Creasing really shouldn't add any new points to the model since it is designed to act more like a dynamic tag that you can remove or change around as needed. However there are other options in the creasing menu that could lead to the actual altercation of the model if they were used instead (like the bevel option with a…